AAudio API updated

[Glenn Kasten]

The AAudio API has been updated for Android O beta. 

Revised material includes:

 - overview documentation

 - API reference

 - sample code

 - NDK r15 beta 2

 - updated header files are part of the NDK update

A summary of major changes from O DP to O Beta is listed below.
This is not a complete list; please consult the overview documentation and API reference for details.

We look forward to your comments and suggestions!

Glenn

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Removed AAUDIO_FORMAT_PCM_I8_24 and AAUDIO_FORMAT_PCM_I32 from aaudio_audio_format_t.
Added AAUDIO_STREAM_STATE_DISCONNECTED to aaudio_stream_state_t.
Removed type aaudio_audio_thread_proc_t.
Removed functions AAudioStream_createThread and AAudioStream_joinThread.
Added functions:

• AAudioStreamBuilder_setDataCallback
  
• AAudioStreamBuilder_setErrorCallback
  
• AAudioStreamBuilder_setFramesPerDataCallback
  

Merged file AAudioDefinitions.h into AAudio.h.

----

[Felix Homann]

Thanks for adding a callback interface!

[Phil Burk]

On Thursday, May 18, 2017 at 4:11:56 AM UTC-7, Felix Homann wrote:

Thanks for adding a callback interface!

You're welcome. Using callbacks you can now get FAST tracks using AAudio. So you can get lower latency than in DP1.

[Jeff McKnight]

Latency definitely seems better now.  I'm measuring about 80ms round-trip latency using the AAudio Echo sample app (hardware: Pixel phone; Android build: OPP2.170420.019) .  Is that roughly what we should expect at this point?

Jeff
----------

[Phil Burk]

Roughly. The read() was not getting a FAST path in DP2 but we are addressing that.

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